Noisy MH lights in fitting

Hi, we just finished installing our light fitting above our tank.
There is just one thing that is really bothering me, the MH are making a huge noise. It almost sounds as if a helicopter is starting it's engines in our lounge.
At this stage my hubby is watching the rugby with the surround sound on full blast.... oh and btw at last the boks are getting tries...

Any way, back to the lights it's a really annoying sound.
Is this normal, is there something I can do to reduce the noise?
Do any of you have a similiar problem?

Guest

It sounds like your light fitting has cooling fans which are noisy. Check first to see whether the lights have fans and if so a little Q20 sprayed into the fans centre will help. Otherwise take it back to where you bought it.

Add 1 tablespoon of 30% hydrogen peroxide per 100 litres every 4 hours to your tank in a power failure to oxygenate your water